Image Display Device Pixel Displacing Correction Boundary Luminance
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Solution Overview
Problem
Image display devices like projectors face challenges in accurately positioning sub-pixels due to chromatic aberration, leading to position shifts and color distortion, especially at the boundaries of the effective display range, which can result in coloring or decreased luminance without the use of parting pixels.
Innovation Solution
An image display device with a pixel displacing correction unit that adjusts image signals to compensate for position shifts and a boundary correction unit that decreases luminance of adjacent color components to prevent coloring, allowing for accurate image display without the need for parting pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pixel displacing correction is performed to compensate for position shifts of sub-pixels, then positioning accuracy of sub-pixels is improved, but sub-pixels near the boundary may be located outside the effective display range causing decreased display luminance
Solution Approach 1:
The patent performs preliminary determination of which sub-pixels will be located outside the effective display range after pixel displacing correction. Based on this determination, it pre-adjusts the luminance of sub-pixels that will remain within the effective display range, ensuring they compensate for the loss of boundary sub-pixels before display occurs.
Solution Approach 2:
The patent changes the luminance parameter of sub-pixels dynamically based on their position and the expected position shift. Sub-pixels near the boundary that will remain within the effective display range have their luminance increased, while the luminance of sub-pixels that will be displaced outside the range is decreased or set to zero, maintaining overall image quality.
2Manufacturing precision
If parting pixels are disposed outside the effective display range to prevent coloring, then color accuracy is improved, but device complexity and size increase
Solution Approach 1:
Instead of adding physical parting pixels to the light modulator structure, the patent creates virtual parting pixels through image signal processing. The luminance information of boundary sub-pixels is copied and redistributed to adjacent sub-pixels within the effective display range, achieving the coloring prevention effect without additional hardware.
Solution Approach 2:
The patent replaces the mechanical approach of adding physical parting pixels with a digital signal processing approach. By manipulating image signals and adjusting luminance parameters software-based, the system achieves color accuracy without increasing hardware complexity or device size.
Data Source
AI summary
A pixel displacing correction section performs a pixel displacing correction adapted to shift a position of the sub-pixel in the display target image on the image signal of the sub-pixel supplied to at least one of the light modulators to thereby compensate position shifts of the display positions of the sub-pixels constituting the images of the respective color components to be displayed on the display surface with respect to a reference position. A boundary correction section decreases the luminance of the image signal of a sub-pixel of another color component than that of the sub-pixel at roughly the same decreasing rate of the display luminance due to the pixel displacing correction of the sub-pixel caused in the pixel, to which the sub-pixel belongs, with respect to the sub-pixel, a part or the whole of which is placed outside the effective display range due to the pixel displacing correction.